On Fri, Nov 12, 2010 at 5:27 PM, Alan Jones <falanclus...@gmail.com> wrote: > On Thu, Nov 11, 2010 at 11:31 PM, Andrew Beekhof <and...@beekhof.net> wrote: >>> colocation X-Y -2: X Y >>> colocation Y-X -2: Y X >> >> the second one is implied by the first and is therefore redundant > > If only that were true!
It is. I know exactly how my code works in this regard. More than likely a score of -2 is simply too low to have any effect. > What happens with the first rule is that other constraints that force > Y to a node will evict X but not the other way around. > What I'm doing is to first apply a "slight" preference for each > resource to each node: > location X-nodeA X 1: nodeA > location Y-nodeB Y 1: nodeB > And then impose absolute constraints that come from the outside environment. > In the particular case that has a problem, the constraint looks like: > location X-not-nodeA X -inf: nodeA > The behavior I expected was for X to be placed on nodeB and Y to > "anti-colocate" onto nodeA because our colocation rule is stronger > than the node preference rule. What happens instead is that both X > and Y run on nodeB. > The similar constraint on Y (by itself) does work: > location Y-not-nodeB Y -inf: nodeB > and results in Y running on nodeA and X running on nodeB. This is the > case whether I have one colocation rule or two, i.e. the second > colocation rule is ignored. > > Looking at the code, I think the solution would be to short-circuit > the recursion when you can only run on one node due to -inf rules > rather than on a loop. Obviously, it would not be a simple change and > needs some thought. > If you have any other suggestions let me know. > Alan > > _______________________________________________ > Pacemaker mailing list: Pacemaker@oss.clusterlabs.org > http://oss.clusterlabs.org/mailman/listinfo/pacemaker > > Project Home: http://www.clusterlabs.org > Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf > Bugs: > http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker > _______________________________________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker